Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1994-06-27
1996-08-20
Chin, Stephen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375368, 370 942, H04J 324
Patent
active
055486185
ABSTRACT:
A device for recovering the carrier of a TDMA signal supplies the complex envelope of this signal on a real channel and an imaginary channel. Circuitry for offsetting the constellation of the complex envelope by .pi./4 supply a complex signal on a main channel and on an auxiliary channel. An energy detector arrangement controls a multiplexer so that it supplies to a correlator whichever of the real or imaginary channels conveys the greater energy. The correlator calculates the correlation level between the multiplexer output signal and a reference singular word. An arrangement for comparing the correlation level with a threshold value indicates detection of the singular word in the signal on the channel applied to the correlator.
REFERENCES:
patent: 4034305 (1977-07-01), Sato
patent: 4035581 (1977-07-01), Milcz et al.
patent: 4412340 (1983-10-01), Bartlett et al.
patent: 4587662 (1986-05-01), Langewellpott
patent: 4897659 (1990-01-01), Mellon
patent: 5138632 (1992-08-01), Uchida
patent: 5365549 (1994-11-01), Kazecki
Le Pape Yannick L.
Sehier Philippe R.
Alcatel Telspace
Chin Stephen
May Timothy J.
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